Get TRANSACTION LEVEL ? - Mailing list pgsql-general

I know that I can set the transaction level with  the
SET TRANSACTION
LEVEL statement.  How can I get the transaction level
from SQL ?
I haven't fount a corresponding get SQL statement in
the 6.5.1 User's
guide and GET TRANSACTION LEVEL didn't work in psql.
Any comments are appreciated.
    Alois

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